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Chuck's 18650 14S120P+1 UK Powerwall.
#1
Hi guys

After many months of following the threads, and asking a ton of stupid questions (sorry many more to come), I'm now processing cells for my homebrew powerwall.

Found a couple of slow sources for old laptop batteries and I've started to process them, latest count is approx 550 between 2000 mAh and 3000 mAh (averaging out at around 2200) for the packs. Approx 200 between 1500 mAh and 2000 mAh that will get put in if I can't source enough cells above 2000 mAh. About another 100 or so that are less than 1500 mAh sat in a box waiting for smaller projects and approx 390 scrap cells that are less than a few hundred mAh, won't charge or can't be recovered.



I've also built a DIY MOT spot welder. I will put up some details on the spot welder forum.



Only problem I now have, just had spinal surgery and I'm not allowed to do anything for a minimum of 6 weeks.
So project has now came to a holt for the time being, still plenty of time on my hands to read many more posts.

I will update as things progress.
Korishan, hbpowerwall, jdeadman like this post
UK Southwest.

6 kWp Solar Panels
APS YC500i Micro Inverters.
Still sourcing and processing cells for powerwall.
Planning on a Sofar Mass Energy ME3000SP AC coupled grid tied inverter.
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#2
Hope you heal quickly and get plenty of rest.
chuckp likes this post
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
Certified 18650 Cell Reclamation Technician

Please come join in general chit-chat and randomness at https://discord.gg/c7gJ5uA
(this chat is not directly affiliated with SecondLifeStorage)
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#3
(09-13-2018, 12:33 AM)Korishan Wrote: Hope you heal quickly and get plenty of rest.

Yeah I'm behaving every time I even look at a cell the Mrs is on my case lol
Korishan and jdeadman like this post
UK Southwest.

6 kWp Solar Panels
APS YC500i Micro Inverters.
Still sourcing and processing cells for powerwall.
Planning on a Sofar Mass Energy ME3000SP AC coupled grid tied inverter.
Reply
#4
(09-13-2018, 12:38 AM)chuckp Wrote:
(09-13-2018, 12:33 AM)Korishan Wrote: Hope you heal quickly and get plenty of rest.

Yeah I'm behaving every time I even look at a cell the Mrs is on my case lol

Misus is on my case every time i look at a cell or talk about batteries.

Take it easy mate.
chuckp likes this post
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#5
Take it easy, man. Exciting project! I've just had to have a break from my powerwall project too, but I'm back in the game with 50 laptop batteries to process!
chuckp likes this post
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#6
(09-14-2018, 05:06 PM)Kenbat Wrote: Take it easy, man.  Exciting project! I've just had to have a break from my powerwall project too, but I'm back in the game with 50 laptop batteries to process!

I think that I may need to sign up to a LA (lithium anonymous) group meeting.

Since I'm not allowed to do anything for the next six weeks i find I'm thinking of ways to try and process my cells that won't stress my back while it heals.

The Mrs is on my case every 5 mins or so because I keep looking at them just sat there begging me to get on with it, God knows what she'd be like it i actually picked one of them up.
Korishan and hermitdave like this post
UK Southwest.

6 kWp Solar Panels
APS YC500i Micro Inverters.
Still sourcing and processing cells for powerwall.
Planning on a Sofar Mass Energy ME3000SP AC coupled grid tied inverter.
Reply
#7
Managed to get a few more cells processed up to 850 now.

So do i build a 14s60p and start storing and then build another 14s60p to add to it or wait until i have enough to build a 14s120p?
UK Southwest.

6 kWp Solar Panels
APS YC500i Micro Inverters.
Still sourcing and processing cells for powerwall.
Planning on a Sofar Mass Energy ME3000SP AC coupled grid tied inverter.
Reply
#8
I am barely getting to 200 processed cell mark. I was thinking of doing 100A pack though I might give it 6 months and see how far I get.

You can always attach additional packs to existing ones to make them larger.
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#9
(09-18-2018, 12:41 AM)chuckp Wrote: Managed to get a few more cells processed up to 850 now.

So do i build a 14s60p and start storing and then build another 14s60p to add to it or wait until i have enough to build a 14s120p?

As long as each string has its packs close in capacity, it doesn't really matter either way. Because once they get connected, they are electrically the same.
It just depends on what you want to move around. Based on your health you mentioned earlier, the lighter packs would be easier on you. The larger the pack, not just the weight goes up, but the awkwardness of carrying it. So you have to keep that all in mind when building the packs.

(09-18-2018, 05:44 AM)hermitdave Wrote: You can always attach additional packs to existing ones to make them larger.

So as long as they are all connected at the same session. You don't want to connect a few packs, then wait awhile to build some more and then connect those. The whole string needs to be connected in one session so you don't have balancing issues that'll have to fight later on.

Unless, of course, the string isn't in operation during the upgrade phase.
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
Certified 18650 Cell Reclamation Technician

Please come join in general chit-chat and randomness at https://discord.gg/c7gJ5uA
(this chat is not directly affiliated with SecondLifeStorage)
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#10
(09-18-2018, 11:25 AM)Korishan Wrote:
(09-18-2018, 12:41 AM)chuckp Wrote: Managed to get a few more cells processed up to 850 now.

So do i build a 14s60p and start storing and then build another 14s60p to add to it or wait until i have enough to build a 14s120p?

As long as each string has its packs close in capacity, it doesn't really matter either way. Because once they get connected, they are electrically the same.
It just depends on what you want to move around. Based on your health you mentioned earlier, the lighter packs would be easier on you. The larger the pack, not just the weight goes up, but the awkwardness of carrying it. So you have to keep that all in mind when building the packs.

(09-18-2018, 05:44 AM)hermitdave Wrote: You can always attach additional packs to existing ones to make them larger.

So as long as they are all connected at the same session. You don't want to connect a few packs, then wait awhile to build some more and then connect those. The whole string needs to be connected in one session so you don't have balancing issues that'll have to fight later on.

Unless, of course, the string isn't in operation during the upgrade phase.

Korishan, yes that was my thinking too about pack size and wieght, while the recovery period from my operation is only  6 weeks, I am only allowed to return to work after that if on light duties for the next 6 months to a year.

Hermitdave, yes I would connect a full 14s60p string and then build another full 14s60p  to connect as a separate string, I'm going with the Batrium bms so the additional longmons won't be an issue.

Also it will help with the location of a rouge cell when one goes down. Less of a pack rebuild.
UK Southwest.

6 kWp Solar Panels
APS YC500i Micro Inverters.
Still sourcing and processing cells for powerwall.
Planning on a Sofar Mass Energy ME3000SP AC coupled grid tied inverter.
Reply


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